/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#include <thrift/thrift-config.h>

#include <thrift/transport/TSimpleFileTransport.h>

#include <sys/types.h>
#include <fcntl.h>

#ifdef _WIN32
#include <Windows.h>
#endif

#ifdef _WIN32
#  define THRIFT_INVALID_HANDLE INVALID_HANDLE_VALUE
#else //not _WIN32
#  define THRIFT_INVALID_HANDLE -1
#endif

namespace apache {
namespace thrift {
namespace transport {

TSimpleFileTransport::TSimpleFileTransport(const std::string& path, bool read, bool write, bool appendMode)
  : TFDTransport(THRIFT_INVALID_HANDLE, TFDTransport::CLOSE_ON_DESTROY)
{
#ifdef _WIN32
  bool readOnly = read == true && write == false;
  DWORD mode = readOnly ? FILE_SHARE_READ : FILE_SHARE_READ | FILE_SHARE_WRITE;
  DWORD flags = readOnly ? GENERIC_READ : GENERIC_READ | GENERIC_WRITE;
  DWORD disposition = readOnly ? OPEN_EXISTING : OPEN_ALWAYS;
  if (readOnly == false && appendMode == false) {
    disposition |= TRUNCATE_EXISTING;
  }
  HANDLE fd = ::CreateFileA(path.c_str(), flags, mode, 0, disposition, FILE_ATTRIBUTE_NORMAL, 0);

  // make sure open call was successful
  if (fd == INVALID_HANDLE_VALUE) {
    throw TTransportException("failed to open file for writing: " + path);
  }
#else
  int flags = 0;
  if (read && write) {
    flags = O_RDWR;
  }
  else if (read) {
    flags = O_RDONLY;
  }
  else if (write) {
    flags = O_WRONLY;
  }
  else {
    throw TTransportException("Neither READ nor WRITE specified");
  }

  if (write) {
    if (appendMode) {
      flags |= O_CREAT | O_APPEND;
    }
    else {
      flags |= O_CREAT | O_TRUNC;
    }
  }

  mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;

  int fd = ::open(path.c_str(), flags, mode);
  if (fd < 0) {
    throw TTransportException("failed to open file for writing: " + path);
  }
#endif

  setFD(fd);
  open();
}

}
}
} // apache::thrift::transport
